# The 50 largest Architecture and Planning companies in New York State

Tamtam tracks 75 Architecture and Planning companies headquartered in New York State. This list ranks the 50 largest by number of employees on LinkedIn, led by HOK, WORKac and Skidmore, Owings & Merrill (SOM). Their median headcount is 178. Half of them were founded in 1981 or later. The most common headquarters are New York (37) and Rochester (3).

The architecture and planning firms in New York State are a mix of large, established companies and younger firms, many of them based in New York City. HOK, founded in 1955, offers design, architecture, engineering, and planning services. Skidmore, Owings & Merrill (SOM), established in 1936, focuses on environmentally-advanced design solutions. WORKac, founded in 2003, specializes in public, cultural, and civic projects, while particular, established in 2019, focuses on steel curtain walls and customized panels.

Many of these companies, such as CannonDesign and Perkins Eastman, emphasize sustainable and innovative design solutions with a focus on client and community impact. A notable pattern among these firms is their commitment to diverse design specializations, ranging from urban planning to architectural engineering.

🇺🇸 New York State · 50 companies · Updated Nov 13, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [HOK](https://www.tamtam.ai/c/hok) (hok.com)<br>A global firm offering design, architecture, engineering, and planning services to create sustainable and innovative solutions for clients and communities | Architecture and Planning | 🇺🇸 New York | 3,080 | 1955 |
| 2 | [WORKac](https://www.tamtam.ai/c/workac) (work.ac)<br>Award-winning architecture firm focused on public, cultural, and civic projects worldwide, emphasizing social and environmental concerns through intelligent and playful design | Architecture and Planning | 🇺🇸 New York | 2,654 | 2003 |
| 3 | [Skidmore, Owings & Merrill (SOM)](https://www.tamtam.ai/c/skidmore-owings-and-merrill-som) (som.com)<br>A leading design firm creating environmentally-advanced solutions for a better future, recognized for carbon neutrality and commitment to equality | Architecture and Planning | 🇺🇸 New York | 2,247 | 1936 |
| 4 | [BIG - Bjarke Ingels Group](https://www.tamtam.ai/c/big-bjarke-ingels-group) (big.dk)<br>A global architecture firm based in multiple cities, specializing in innovative and pragmatic urban design, research, and development, with a focus on parental leave support | Architecture and Planning | 🇺🇸 Brooklyn | 1,994 | 2006 |
| 5 | [CannonDesign](https://www.tamtam.ai/c/cannondesign) (cannondesign.com)<br>An integrated design firm leveraging creative thinkers to develop solutions for clients and society, focusing on human flourishing through Living-Centered Design | Architecture and Planning | 🇺🇸 New York | 1,761 | 1945 |
| 6 | [LaBella Associates](https://www.tamtam.ai/c/labella-associates) (labellapc.com)<br>LaBella Associates is a nationally recognized Design Professional Corporation that creates partnerships with clients to deliver exceptional results in buildings, energy, infrastructure, and environmental projects | Architecture and Planning | 🇺🇸 Rochester | 1,613 | 1978 |
| 7 | [KPF](https://www.tamtam.ai/c/kpf) (kpf.com)<br>Architectural practice designing diverse, innovative buildings globally, focusing on quality, contextual sensitivity, and smart solutions without stylistic constraints | Architecture and Planning | 🇺🇸 New York | 1,463 | 1976 |
| 8 | [Perkins Eastman](https://www.tamtam.ai/c/perkins-eastman) (perkinseastman.com)<br>Global architecture and design firm focusing on creating a positive impact on people's lives through progressive and inventive design solutions worldwide | Architecture and Planning | 🇺🇸 New York | 1,107 | 1981 |
| 9 | [CPL](https://www.tamtam.ai/c/cpl-fairport) (cplteam.com)<br>A multi-disciplined team of experts in design and engineering, specializing in projects for community, healthcare, education, and transportation sectors | Architecture and Planning | 🇺🇸 Fairport | 892 | 1975 |
| 10 | [HLW](https://www.tamtam.ai/c/hlw) (hlw.com)<br>Leading international firm providing full-service planning, architecture, and design for innovative companies across various sectors, with a mission to question norms and build the future | Architecture and Planning | 🇺🇸 New York | 686 | 1885 |
| 11 | [H2M architects + engineers](https://www.tamtam.ai/c/h2m-architects-engineers) (h2m.com)<br>A multi-disciplinary consulting and design firm providing architecture, engineering, environmental services, and more with offices in New York and New Jersey | Architecture and Planning | 🇺🇸 Melville | 686 | 1933 |
| 12 | [Cheese Cake Factory](https://www.tamtam.ai/c/cheese-cake-factory)<br>An architecture and planning firm located in Westbury, New York, specializing in creating innovative designs for various projects | Architecture and Planning | 🇺🇸 Westbury | 654 |  |
| 13 | [Rockwell Group](https://www.tamtam.ai/c/rockwell-group) (rockwellgroup.com)<br>Innovative interdisciplinary architecture and design firm based in New York, creating extraordinary experiences and environments worldwide through merging performance and architecture | Architecture and Planning | 🇺🇸 New York | 459 | 1984 |
| 14 | [WENDEL Companies](https://www.tamtam.ai/c/wendel-companies) (wendelcompanies.com)<br>A multi-disciplinary firm offering architecture, engineering, energy efficiency, and construction management services with a focus on delivering innovative solutions nationwide | Architecture and Planning | 🇺🇸 Williamsville | 361 | 1940 |
| 15 | [RAMSA \| Robert A.M. Stern Architects](https://www.tamtam.ai/c/ramsa-robert-a-m-stern-architects) (ramsa.com)<br>Global architecture specializing in residential, academic, and cultural buildings in New York City Dedicated to research-driven practices and preserving a sense of place | Architecture and Planning | 🇺🇸 New York | 356 | 1969 |
| 16 | [Columbia University Graduate School of Architecture, Planning & Preservation](https://www.tamtam.ai/c/columbia-university-graduate-school-of-architecture-planning-and-preservation) (arch.columbia.edu)<br>Leading research university fostering a community engaged in architecture, planning, preservation, urban design, and real estate development through innovative degree programs | Architecture and Planning | 🇺🇸 New York | 341 | 1881 |
| 17 | [TPG Architecture](https://www.tamtam.ai/c/tpg-architecture) (tpgarchitecture.com)<br>A New York City design firm creating interior spaces to meet clients' strategic objectives in workplace, retail, hospitality, healthcare, and commercial properties globally | Architecture and Planning | 🇺🇸 New York | 280 | 1979 |
| 18 | [Bergmann](https://www.tamtam.ai/c/bergmann) (bergmannpc.com)<br>An architecture, engineering, and planning firm delivering creative solutions to clients across the USA and Canada with a focus on sustainability and community engagement | Architecture and Planning | 🇺🇸 Rochester | 266 | 1980 |
| 19 | [Shen Milsom & Wilke (SM&W)](https://www.tamtam.ai/c/shen-milsom-and-wilke-sm-and-w) (smwllc.com)<br>A global consulting firm specializing in acoustics, audiovisual, IT, security, and medical equipment planning to create innovative user experiences for clients worldwide | Architecture and Planning | 🇺🇸 New York | 240 | 1986 |
| 20 | [SHoP Architects](https://www.tamtam.ai/c/shop-architects) (shoparc.com)<br>Innovative architecture firm focused on designing buildings and spaces that enhance public life through diverse expertise and real-world constraints | Architecture and Planning | 🇺🇸 New York | 233 | 1996 |
| 21 | [Beyer Blinder Belle](https://www.tamtam.ai/c/beyer-blinder-belle) (beyerblinderbelle.com)<br>Award-winning architecture and design firm with expertise in preservation, urban design, and new construction across various building sectors and typologies | Architecture and Planning | 🇺🇸 New York | 213 | 1968 |
| 22 | [HLB Lighting Design](https://www.tamtam.ai/c/hlb-lighting-design) (hlblighting.com)<br>A leading global architectural lighting design firm offering integrated services, sustainable solutions, custom product development, and cutting-edge technology for transformative client experiences | Architecture and Planning | 🇺🇸 New York | 186 | 1968 |
| 23 | [architecture+](https://www.tamtam.ai/c/architecture) (aplususa.com)<br>architecture+ is a highly respected architectural and planning firm in Troy, NY, providing design and service-oriented solutions for diverse projects since 1984 | Architecture and Planning | 🇺🇸 Troy | 186 | 1984 |
| 24 | [HUNT Engineers, Architects & Surveyors](https://www.tamtam.ai/c/hunt-engineers-architects-and-surveyors) (hunt-eas.com)<br>A full-service consulting and design firm established in 1974, serving various clients with a focus on professionalism, integrity, quality, and leadership | Architecture and Planning | 🇺🇸 Horseheads | 185 | 1974 |
| 25 | [Handel Architects](https://www.tamtam.ai/c/handel-architects) (handelarchitects.com)<br>Global architecture practice specializing in urban design, density, sustainability, and creating vibrant urban environments through innovative residential building design | Architecture and Planning | 🇺🇸 New York | 178 | 1994 |
| 26 | [Mancini Duffy](https://www.tamtam.ai/c/mancini-duffy) (manciniduffy.com)<br>A NYC-based design firm with over 100 years of experience, focusing on architecture, planning, and interior design with a tech-forward approach | Architecture and Planning | 🇺🇸 New York | 173 | 1915 |
| 27 | [Theatre Projects](https://www.tamtam.ai/c/theatre-projects) (theatreprojects.com)<br>Design and planning of diverse venues worldwide, enhancing community interaction through strategic, operational, and technological expertise in performance spaces. | Architecture and Planning | 🇺🇸 New York | 164 | 1957 |
| 28 | [Field Operations](https://www.tamtam.ai/c/field-operations) (fieldoperations.net)<br>A leading urban design and landscape architecture firm specializing in creating vibrant public spaces rooted in ecology and context | Architecture and Planning | 🇺🇸 New York | 162 | 1999 |
| 29 | [ODA](https://www.tamtam.ai/c/oda) (oda-architecture.com)<br>Innovative architecture firm challenging urban living norms, prioritizing human needs and creating transformative designs in New York and beyond | Architecture and Planning | 🇺🇸 New York | 159 | 2007 |
| 30 | [Dattner Architects](https://www.tamtam.ai/c/dattner-architects) (dattner.com)<br>A mission-driven, women-owned architectural firm in NYC creating essential projects that enrich urban experiences, transform environments, and strengthen communities | Architecture and Planning | 🇺🇸 New York | 158 | 1964 |
| 31 | [RAND Engineering & Architecture, DPC](https://www.tamtam.ai/c/rand-engineering-and-architecture-dpc) (randpc.com)<br>An established NYC firm offering expert evaluation, design, and administration of property repair, restoration, new construction, and compliance services | Architecture and Planning | 🇺🇸 New York | 129 | 1987 |
| 32 | [PETER PENNOYER ARCHITECTS, DPC](https://www.tamtam.ai/c/peter-pennoyer-architects-dpc) (ppapc.com)<br>Award-winning traditional architecture firm based in Manhattan and Miami, known for classicism, historic preservation, and forward-looking interpretations of history in residential, commercial, and institutional projects | Architecture and Planning | 🇺🇸 New York | 65 |  |
| 33 | [Modernus](https://www.tamtam.ai/c/modernus) (modernus.com)<br>Specializing in innovative architectural products, doors, and surfaces, we empower designers with versatile and customizable solutions that push the boundaries of interior design | Architecture and Planning | 🇺🇸 New York | 42 | 2003 |
| 34 | [ESKW/Architects](https://www.tamtam.ai/c/eskw-architects) (eskwarchitects.com)<br>A well-established NYC architecture practice offering design excellence for institutional, residential, and commercial projects, focusing on client concerns and community needs | Architecture and Planning | 🇺🇸 New York | 33 | 1960 |
| 35 | [G3 Architecture Interiors Planning](https://www.tamtam.ai/c/g3-architecture-interiors-planning) (g3arch.com)<br>G3 offers high-quality architectural and interior design solutions for corporations, institutions, developers, and property owners, translating clients' vision into exceptional spaces | Architecture and Planning | 🇺🇸 New York | 30 | 1994 |
| 36 | [ikon.5 architects](https://www.tamtam.ai/c/ikon-5-architects) (ikon5architects.com)<br>Innovative design studio specializing in architecture and landscape design, crafting unique and storytelling buildings that celebrate community diversity | Architecture and Planning | 🇺🇸 New York | 28 | 2003 |
| 37 | [Fohlio, Inc.](https://www.tamtam.ai/c/fohlio-inc) (bit.ly)<br>A platform for Architects, Designers, Engineers, and Contractors to easily research, select, and incorporate building products into their projects efficiently | Architecture and Planning | 🇺🇸 New York | 26 | 2015 |
| 38 | [Stefan Al Architects](https://www.tamtam.ai/c/stefan-al-architects) (stefanal.com)<br>A design studio specializing in sustainable architecture and urban design, focusing on innovative solutions for environmentally conscious projects | Architecture and Planning | 🇺🇸 New York | 24 |  |
| 39 | [Goshow Architects](https://www.tamtam.ai/c/goshow-architects) (goshow.com)<br>A NYC woman-owned architecture firm dedicated to sustainable design solutions for healthy living and learning environments, offering growth opportunities for employees | Architecture and Planning | 🇺🇸 New York | 23 | 1978 |
| 40 | [HBT Architects - A Division of MRB Group](https://www.tamtam.ai/c/hbt-architects-a-division-of-mrb-group) (hbtarchitects.com)<br>A forward-thinking architectural firm offering creative and collaborative design solutions for a diverse client base, focusing on personalized attention and successful project integration | Architecture and Planning | 🇺🇸 Rochester | 21 | 2000 |
| 41 | [Curti's Landscaping, Inc.](https://www.tamtam.ai/c/curti-s-landscaping-inc) (curtilandscaping.com)<br>Offering landscape excellence since 1987, our company provides innovative designs, full-service construction, and year-round maintenance for residential and commercial properties | Architecture and Planning | 🇺🇸 Valley Cottage | 20 | 1987 |
| 42 | [Fisher Dachs Associates, Theatre Planning & Design](https://www.tamtam.ai/c/fisher-dachs-associates-theatre-planning-and-design) (fisherdachs.com)<br>A leading theatre planning and design consultant with over 50 years of experience creating innovative performance spaces worldwide | Architecture and Planning | 🇺🇸 New York | 18 |  |
| 43 | [H3 Architecture](https://www.tamtam.ai/c/h3-architecture) (h3hc.com)<br>A collaborative community of architects specializing in public buildings, combining history, innovation, and sustainability to create tailored design solutions | Architecture and Planning | 🇺🇸 New York | 17 | 1962 |
| 44 | [Paul A. Castrucci, Architects](https://www.tamtam.ai/c/paul-a-castrucci-architects) (castrucciarchitect.com)<br>A design firm specializing in sustainable architecture, focusing on Passive House and Net Zero certified buildings, energy conservation, and code consultation | Architecture and Planning | 🇺🇸 New York | 16 | 1984 |
| 45 | [Stuart-Lynn Company, Inc](https://www.tamtam.ai/c/stuart-lynn-company-inc) (stuart-lynn.com)<br>A construction consulting firm providing cost estimating and project management services for a variety of clients nationwide, specializing in complex architectural projects | Architecture and Planning | 🇺🇸 New York | 16 | 2001 |
| 46 | [Get My C.O.](https://www.tamtam.ai/c/get-my-c-o) (getmyco.com)<br>Assisting clients in obtaining their Certificate of Occupancy by providing legalizations services, professional drawings, handling paperwork, and connecting with contractors if needed | Architecture and Planning | 🇺🇸 Pleasantville | 15 | 2018 |
| 47 | [PK-30 System](https://www.tamtam.ai/c/pk-30-system) (pk30system.com)<br>Manufacturer of aluminum demountable wall system for flexible, environmentally friendly, and cost-effective interior space division with various configurations | Architecture and Planning | 🇺🇸 High Falls | 15 |  |
| 48 | [a r c h i p e l a g o s](https://www.tamtam.ai/c/a-r-c-h-i-p-e-l-a-g-o-s) (archipelagos.co)<br>An architecture studio focusing on ecological housing and landscape development, utilizing a non-hierarchical collaborative model with expertise in various areas | Architecture and Planning | 🇺🇸 New York | 14 | 2001 |
| 49 | [FZAD Architecture & Design](https://www.tamtam.ai/c/fzad-architecture-and-design) (fzad.com)<br>An architectural and design firm specializing in high-end retail and residential projects, offering comprehensive services from concept to completion | Architecture and Planning | 🇺🇸 New York | 14 | 1986 |
| 50 | [ZH Architects](https://www.tamtam.ai/c/zh-architects) (zh-architects.com)<br>Dynamic architecture partnership with a focus on modern design and sustainable building techniques, recognized for award-winning projects and thought leadership in sustainability | Architecture and Planning | 🇺🇸 New York | 12 | 2002 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 13, 2026.

## More company lists in New York State

- [The largest companies in New York State](https://www.tamtam.ai/l/largest-companies-new-york-state) (12,430)
- [Multinational companies in New York State](https://www.tamtam.ai/l/multinational-companies-new-york-state) (2,214)
- [Financial services firms in New York State](https://www.tamtam.ai/l/financial-services-firms-new-york-state) (1,273)
- [Financial Services companies in New York State](https://www.tamtam.ai/l/financial-services-companies-new-york-state) (1,077)
- [SaaS companies in New York State](https://www.tamtam.ai/l/saas-companies-new-york-state) (1,060)
- [Professional services firms in New York State](https://www.tamtam.ai/l/professional-services-firms-new-york-state) (955)
- [Real Estate companies in New York State](https://www.tamtam.ai/l/real-estate-companies-new-york-state) (789)
- [Venture capital and private equity firms in New York State](https://www.tamtam.ai/l/vc-and-private-equity-firms-new-york-state) (758)
- [Software Development companies in New York State](https://www.tamtam.ai/l/software-development-companies-new-york-state) (696)
- [Education providers in New York State](https://www.tamtam.ai/l/education-companies-new-york-state) (656)
- [AI companies in New York State](https://www.tamtam.ai/l/ai-companies-new-york-state) (584)
- [IT Services and IT Consulting companies in New York State](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-new-york-state) (570)
- [Retail chains in New York State](https://www.tamtam.ai/l/retail-chains-new-york-state) (557)
- [Healthcare providers in New York State](https://www.tamtam.ai/l/healthcare-providers-new-york-state) (494)
- [Companies with a mobile app in New York State](https://www.tamtam.ai/l/companies-with-mobile-app-new-york-state) (491)
- [Subscription businesses in New York State](https://www.tamtam.ai/l/subscription-businesses-new-york-state) (485)
- [Consulting firms in New York State](https://www.tamtam.ai/l/consulting-firms-new-york-state) (474)
- [Advertising Services companies in New York State](https://www.tamtam.ai/l/advertising-services-companies-new-york-state) (473)
- [IT services companies in New York State](https://www.tamtam.ai/l/it-services-companies-new-york-state) (468)
- [Investment Management companies in New York State](https://www.tamtam.ai/l/investment-management-companies-new-york-state) (457)
- [Marketing and communications agencies in New York State](https://www.tamtam.ai/l/marketing-agencies-new-york-state) (449)
- [Companies with in-house R&D in New York State](https://www.tamtam.ai/l/r-and-d-companies-new-york-state) (418)
- [Hospitals and Health Care companies in New York State](https://www.tamtam.ai/l/hospitals-and-health-care-companies-new-york-state) (408)
- [Venture Capital and Private Equity Principals companies in New York State](https://www.tamtam.ai/l/venture-capital-and-private-equity-principals-companies-new-york-state) (398)

## The same list elsewhere in United States

- [Architecture and Planning companies in the United States](https://www.tamtam.ai/l/architecture-and-planning-companies-united-states) (436)
- [Architecture and Planning companies in California](https://www.tamtam.ai/l/architecture-and-planning-companies-california) (58)
- [Architecture and Planning companies in Texas](https://www.tamtam.ai/l/architecture-and-planning-companies-texas) (28)
- [Architecture and Planning companies in New York](https://www.tamtam.ai/l/architecture-and-planning-companies-new-york) (55)

## The same list elsewhere

- [Architecture and Planning companies in the world](https://www.tamtam.ai/l/architecture-and-planning-companies-in-the-world) (1,380)

---

Source: https://www.tamtam.ai/l/architecture-and-planning-companies-new-york-state